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Encyclopedia of the Nations- Africa, Ethiopia. Retrieved December 7, 2009 from http://www.nationsencyclopedia.com/Africa/Ethiopia-CLIMATE.html
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International Governmental Panel on Climate Change. Retrieved December 9, 2009 from http://www.ipcc.ch/
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National Bank of Ethiopia, 1999. Annual Report 1997-98, (Ethiopian Calendar 1990)
Theobald, David. GIS concepts and ArcGIS Methods (v 9.3) Conservation Planning Technologies, Inc., 2003.
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